| /* $OpenBSD: readpassphrase.c,v 1.26 2016/10/18 12:47:18 millert Exp $ */ |
| |
| /* |
| * Copyright (c) 2000-2002, 2007, 2010 |
| * Todd C. Miller <Todd.Miller@courtesan.com> |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| * |
| * Sponsored in part by the Defense Advanced Research Projects |
| * Agency (DARPA) and Air Force Research Laboratory, Air Force |
| * Materiel Command, USAF, under agreement number F39502-99-1-0512. |
| */ |
| |
| /* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */ |
| |
| #include "includes.h" |
| |
| #ifndef HAVE_READPASSPHRASE |
| |
| #include <termios.h> |
| #include <signal.h> |
| #include <ctype.h> |
| #include <fcntl.h> |
| #include <readpassphrase.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #ifndef TCSASOFT |
| /* If we don't have TCSASOFT define it so that ORing it it below is a no-op. */ |
| # define TCSASOFT 0 |
| #endif |
| |
| /* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */ |
| #if !defined(_POSIX_VDISABLE) && defined(VDISABLE) |
| # define _POSIX_VDISABLE VDISABLE |
| #endif |
| |
| #ifndef _NSIG |
| # ifdef NSIG |
| # define _NSIG NSIG |
| # else |
| # define _NSIG 128 |
| # endif |
| #endif |
| |
| static volatile sig_atomic_t signo[_NSIG]; |
| |
| static void handler(int); |
| |
| char * |
| readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags) |
| { |
| ssize_t nr; |
| int input, output, save_errno, i, need_restart; |
| char ch, *p, *end; |
| struct termios term, oterm; |
| struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm; |
| struct sigaction savetstp, savettin, savettou, savepipe; |
| |
| /* I suppose we could alloc on demand in this case (XXX). */ |
| if (bufsiz == 0) { |
| errno = EINVAL; |
| return(NULL); |
| } |
| |
| restart: |
| for (i = 0; i < _NSIG; i++) |
| signo[i] = 0; |
| nr = -1; |
| save_errno = 0; |
| need_restart = 0; |
| /* |
| * Read and write to /dev/tty if available. If not, read from |
| * stdin and write to stderr unless a tty is required. |
| */ |
| if ((flags & RPP_STDIN) || |
| (input = output = open(_PATH_TTY, O_RDWR)) == -1) { |
| if (flags & RPP_REQUIRE_TTY) { |
| errno = ENOTTY; |
| return(NULL); |
| } |
| input = STDIN_FILENO; |
| output = STDERR_FILENO; |
| } |
| |
| /* |
| * Turn off echo if possible. |
| * If we are using a tty but are not the foreground pgrp this will |
| * generate SIGTTOU, so do it *before* installing the signal handlers. |
| */ |
| if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) { |
| memcpy(&term, &oterm, sizeof(term)); |
| if (!(flags & RPP_ECHO_ON)) |
| term.c_lflag &= ~(ECHO | ECHONL); |
| #ifdef VSTATUS |
| if (term.c_cc[VSTATUS] != _POSIX_VDISABLE) |
| term.c_cc[VSTATUS] = _POSIX_VDISABLE; |
| #endif |
| (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term); |
| } else { |
| memset(&term, 0, sizeof(term)); |
| term.c_lflag |= ECHO; |
| memset(&oterm, 0, sizeof(oterm)); |
| oterm.c_lflag |= ECHO; |
| } |
| |
| /* |
| * Catch signals that would otherwise cause the user to end |
| * up with echo turned off in the shell. Don't worry about |
| * things like SIGXCPU and SIGVTALRM for now. |
| */ |
| sigemptyset(&sa.sa_mask); |
| sa.sa_flags = 0; /* don't restart system calls */ |
| sa.sa_handler = handler; |
| (void)sigaction(SIGALRM, &sa, &savealrm); |
| (void)sigaction(SIGHUP, &sa, &savehup); |
| (void)sigaction(SIGINT, &sa, &saveint); |
| (void)sigaction(SIGPIPE, &sa, &savepipe); |
| (void)sigaction(SIGQUIT, &sa, &savequit); |
| (void)sigaction(SIGTERM, &sa, &saveterm); |
| (void)sigaction(SIGTSTP, &sa, &savetstp); |
| (void)sigaction(SIGTTIN, &sa, &savettin); |
| (void)sigaction(SIGTTOU, &sa, &savettou); |
| |
| if (!(flags & RPP_STDIN)) |
| (void)write(output, prompt, strlen(prompt)); |
| end = buf + bufsiz - 1; |
| p = buf; |
| while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') { |
| if (p < end) { |
| if ((flags & RPP_SEVENBIT)) |
| ch &= 0x7f; |
| if (isalpha((unsigned char)ch)) { |
| if ((flags & RPP_FORCELOWER)) |
| ch = (char)tolower((unsigned char)ch); |
| if ((flags & RPP_FORCEUPPER)) |
| ch = (char)toupper((unsigned char)ch); |
| } |
| *p++ = ch; |
| } |
| } |
| *p = '\0'; |
| save_errno = errno; |
| if (!(term.c_lflag & ECHO)) |
| (void)write(output, "\n", 1); |
| |
| /* Restore old terminal settings and signals. */ |
| if (memcmp(&term, &oterm, sizeof(term)) != 0) { |
| const int sigttou = signo[SIGTTOU]; |
| |
| /* Ignore SIGTTOU generated when we are not the fg pgrp. */ |
| while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 && |
| errno == EINTR && !signo[SIGTTOU]) |
| continue; |
| signo[SIGTTOU] = sigttou; |
| } |
| (void)sigaction(SIGALRM, &savealrm, NULL); |
| (void)sigaction(SIGHUP, &savehup, NULL); |
| (void)sigaction(SIGINT, &saveint, NULL); |
| (void)sigaction(SIGQUIT, &savequit, NULL); |
| (void)sigaction(SIGPIPE, &savepipe, NULL); |
| (void)sigaction(SIGTERM, &saveterm, NULL); |
| (void)sigaction(SIGTSTP, &savetstp, NULL); |
| (void)sigaction(SIGTTIN, &savettin, NULL); |
| (void)sigaction(SIGTTOU, &savettou, NULL); |
| if (input != STDIN_FILENO) |
| (void)close(input); |
| |
| /* |
| * If we were interrupted by a signal, resend it to ourselves |
| * now that we have restored the signal handlers. |
| */ |
| for (i = 0; i < _NSIG; i++) { |
| if (signo[i]) { |
| kill(getpid(), i); |
| switch (i) { |
| case SIGTSTP: |
| case SIGTTIN: |
| case SIGTTOU: |
| need_restart = 1; |
| } |
| } |
| } |
| if (need_restart) |
| goto restart; |
| |
| if (save_errno) |
| errno = save_errno; |
| return(nr == -1 ? NULL : buf); |
| } |
| DEF_WEAK(readpassphrase); |
| |
| #if 0 |
| char * |
| getpass(const char *prompt) |
| { |
| static char buf[_PASSWORD_LEN + 1]; |
| |
| return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF)); |
| } |
| #endif |
| |
| static void handler(int s) |
| { |
| |
| signo[s] = 1; |
| } |
| #endif /* HAVE_READPASSPHRASE */ |